- create_bar_tab.php: Replaced mysqli_real_escape_string() and procedural mysqli_query/mysqli_num_rows/mysqli_error with OOP prepared statements
- submit_order.php: Replaced mysqli_real_escape_string() and procedural mysqli_query/mysqli_error with OOP prepared statements
- fetch_drinks.php: Replaced mysqli_real_escape_string() and procedural mysqli_query/mysqli_fetch_assoc with OOP prepared statements
- comment_box.php: Removed mysqli_real_escape_string(), added CSRF token validation for comment submission
All files now use consistent OOP MySQLi approach with proper parameter binding. Fixes PHP 8.1+ compatibility and improves security against multi-byte character injection.
